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Free-length failure tests of strand samples (that is, tensiletests performed using special sand-grip anchors to achievestrand failure within the free length away from the anchorages)conducted by Walsh and Kurama31,32 showed thatthe true (that is, not affected by the anchorages) ultimatefracture strain capacity of seven-wire, low-relaxation posttensioningstrand is generally between 0.060 and 0.075.Thus, the strain limit of 0.01 as governed by individualwire fractures inside the anchorages is restrictive relative tothe actual material capacity of the strand.
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